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i386: Add Intel Processor Trace feature support

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Expose Intel Processor Trace feature to guest.

To make Intel PT live migration safe and get same CPUID information
with same CPU model on diffrent host. CPUID[14] is constant in this
patch. Intel PT use EPT is first supported in IceLake, the CPUID[14]
get on this machine as default value. Intel PT would be disabled
if any machine don't support this minial feature list.

Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Message-Id: <1520182116-16485-1-git-send-email-luwei.kang@intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Chao Peng 2018-03-05 00:48:35 +08:00 • committed by Eduardo Habkost
parent be7773268d
commit e37a5c7fa4
3 changed files with 100 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

23
target/i386/kvm.c
View file

@ -869,6 +869,29 @@ int kvm_arch_init_vcpu(CPUState *cs)
c = &cpuid_data.entries[cpuid_i++];
}
break;
case 0x14: {
uint32_t times;
c->function = i;
c->index = 0;
c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
times = c->eax;
for (j = 1; j <= times; ++j) {
if (cpuid_i == KVM_MAX_CPUID_ENTRIES) {
fprintf(stderr, "cpuid_data is full, no space for "
"cpuid(eax:0x14,ecx:0x%x)\n", j);
abort();
}
c = &cpuid_data.entries[cpuid_i++];
c->function = i;
c->index = j;
c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->edx);
}
break;
}
default:
c->function = i;
c->flags = 0;